Add ipex support to HuggingFaceEmbeddings

[echarlaix]

ONNX and OpenVINO models are available by specifying the backend argument (the model is loaded using optimum https://github.com/huggingface/optimum)

from langchain_huggingface import HuggingFaceEmbeddings

embedding = HuggingFaceEmbeddings(
    model_name=model_id,
    model_kwargs={"backend": "onnx"},
)

With this PR we also enable the IPEX backend

from langchain_huggingface import HuggingFaceEmbeddings

embedding = HuggingFaceEmbeddings(
    model_name=model_id,
    model_kwargs={"backend": "ipex"},
)

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[echarlaix]

@Jofthomas @efriis let me know if that works for you

[efriis]

@echarlaix any interest in becoming a maintainer of the langchain-huggingface package? That way you could merge+release these as you please, and you'd only make PRs that we'd have to review to update docs!

[echarlaix]

@echarlaix any interest in becoming a maintainer of the langchain-huggingface package? That way you could merge+release these as you please, and you'd only make PRs that we'd have to review to update docs!

Thanks a lot for suggesting this @efriis, happy to help on anything related to optimum cc @Jofthomas